CUMMINS N14 Specifications Page 543
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Valve Guide Height (Installed) 32.26 MIN 1.270
32.51 MAX 1.280
Crosshead Guide O.D. 10.975 MIN 0.4321
11.011 MAX 0.4335
Crosshead Guide Height (Installed) 47.25 MIN 1.860
47.75 MAX 1.880
Valve Seat Area Width 1 1.60 MIN 0.063
3.18 MAX 0.125
Injector Tip Protrusion 1.52 MIN 0.060
1.78 MAX 0.070
Valve Seat to Valve Guide Concentricity
(Per 360 Degrees)
0.09 MAX 0.0035
Valve Protrusion
• Pre-88 NT 2.67 MIN 0.105
4.19 MAX 0.165
• 88 NT 1.40 MIN 0.055
2.16 MAX 0.085
Specifications Cylinder Head - Rebuild Specifications
NT 855 Page 18-39
Part or Assembly Ref. Point mm in
- Foreword 2
- TABLE OF CONTENTS 3
- Section I - Introduction 5
- Manual Organization 6
- General Repair Instructions 7
- General Safety Instructions 8
- Symbols Used in this Manual 9
- Illustrations 13
- Glossary Of Terms 14
- Engine Identification 16
- Engine Diagrams 17
- N14Page i-14 18
- N14 Page i-15 19
- General Cleaning Instructions 20
- Engine Disassembly (00-01) 30
- Coolant - Drainage 31
- Coolant Filter - Removal 31
- Crankcase Breather - Removal 32
- Turbocharger - Removal 32
- Exhaust Manifold - Removal 33
- Starting Motor - Removal 33
- Fan and Fan Spacer - Removal 33
- Alternator Belts - Removal 33
- Alternator - Removal 34
- Water Header Covers - Removal 36
- Flywheel - Removal 38
- Flywheel Housing - Removal 39
- Rear Cover - Removal 40
- Fan Belts - Removal 40
- - Removal 41
- Water Pump Belt - Removal 41
- Thermostat Housing - Removal 42
- Outlet Tubes - Removal 42
- Water Pump - Removal 43
- Vibration Damper - Removal 43
- (ECM) - Removal 48
- CELECT™ Ambient Air Pressure 48
- Sensor - Removal 48
- Fuel Pump - Removal 49
- Air Compressor - Removal 50
- Viscosity Sensor - Removal 52
- Intake Manifold - Removal 53
- Engine Brakes - Removal 54
- Valve Crossheads - Removal 55
- Push Tubes - Removal 55
- Injectors - Removal 55
- Fuel Crossovers - Removal 57
- Cylinder Heads - Removal 57
- Lubricating Oil Pan - Removal 59
- Gear Cover - Removal 59
- Camshaft - Removal 59
- Cylinder Liners - Removal 62
- Crankshaft - Removal 64
- Engine Assembly (00-02) 66
- Crankshaft - Installation 68
- Rear Cover - Installation 85
- Bore Alignment - Measurement 88
- Face Alignment - Measurement 90
- Flywheel - Installation 92
- Cylinder Heads - Installation 96
- Camshaft - Installation 98
- Timing Tool Installation 102
- (EPS) - Installation 111
- Gear Cover - Installation 112
- Injectors - Installation 120
- STC Engines 121
- Push Tubes - Installation 122
- Installation 124
- Injector and Valve Adjustment 125
- Engine Brake - Installation 135
- Engine Brake - Adjustment 135
- C-Brake - Alternate Method 138
- Jacobs Brake 139
- Sensor - Installation 141
- Fuel Tubing - Installation 143
- Air Compressor - Installation 144
- Fuel Pump - Installation 144
- Water Pump - Installation 153
- Adjustment 154
- - Installation 155
- Outlet Tubes - Installation 155
- Alternator - Installation 162
- Starting Motor - Installation 164
- Turbocharger - Installation 165
- Coolant Filter - Installation 167
- Section Contents 169
- N14Page 1-6 174
- Dowel Pin - Removal 178
- Camshaft Bushings - Removal 179
- Cylinder Block - Cleaning 179
- Camshaft Bore - Cleaning 183
- Camshaft Bore - Inspection 183
- Cylinder Block - Inspection 188
- Coolant Passage - Inspection 189
- Coolant Passage - Repairing 191
- Dowel Pin - Installation 202
- Cleaning 204
- Inspection 206
- Inspection (01-09) 215
- Alignment - Inspection 216
- Twist - Inspection 217
- Inspection (01-11) 219
- Inspection (01-12) 220
- Inspection (01-13) 221
- Inspection (01-16) 230
- Thrust Bearings - Inspection 231
- Cylinder Head - Service Tools 244
- Cylinder Head - Exploded View 248
- Disassembly 252
- Grinding the Valve Seats 259
- Assembly 263
- Guides (02-03) 267
- Seat Inserts (02-05) 269
- Sleeves (02-07) 273
- Checking (02-09) 279
- Seating for Reuse (02-10) 280
- Crack Inspection (02-11) 282
- Checking for Reuse (02-12) 283
- Inspection (02-13) 284
- N14Page 3-4 288
- Cleaning and Inspection 292
- Rocker Lever - Magnetic Crack 298
- Inspection (03-03) 298
- Inspection for Reuse (03-04) 298
- Water Manifold Tube - Removal 299
- Inspection for Reuse (03-06) 303
- Replacement (03-08) 305
- Inspection - Magnetic Crack 319
- Inspection - Dimensional 319
- Cleaning - PT Fuel Pump 328
- Cleaning - CELECT™ Fuel Pump 329
- Inspection - PT Fuel Pump 329
- Fuel Pump - Rebuild (05-02) 332
- Inspection for Reuse (06-01) 339
- Inspection - CELECT™ 340
- Injectors - Rebuild (06-02) 341
- Reuse (06-05) 342
- Inspection for Reuse (07-01) 350
- Inspection for Reuse (07-05) 352
- Bushing - Replacement (07-07) 361
- Bushing - Replacement (07-08) 367
- Shaft - Replacement (07-09) 368
- Replacement (07-10) 369
- Rebuild (07-11) 370
- Testing - Oil Cooler Core 375
- Poppet Valve Spring 377
- Inspection (08-01) 386
- Water Pump Assembly - Rebuild 387
- Inspection (08-05) 399
- Inspection (08-09) 404
- Drive Units - Service Tools 406
- Accessory Drive 408
- Inspection for Reuse (09-01) 409
- Inspection for Reuse (09-04) 417
- Replacement (09-05) 417
- Checking (10-02) 426
- - Checking (10-03) 426
- Inspection for Reuse (11-01) 431
- Exhaust Manifold Turbocharger 432
- Air Compressor 434
- Air Compressor - Cleaning and 435
- Inspection for Reuse (12-01) 435
- General Information 442
- Cummins 1991 N14 Heavy Duty 443
- Engine Operating Curve 443
- Definitions: 443
- General Run-In Procedures 444
- Fuel Rate 452
- Fuel Inlet Restriction 452
- Fuel Pressure 453
- Fuel Drain Line Restriction 453
- Systems (14-02) 458
- Dynamometer (14-03) 464
- Dynamometer Worksheet 468
- Chassis Dynamometer Operation 469
- Dynamometer (14-05) 471
- Intake Manifold Pressure 474
- Charge Air Cooler Restriction 475
- Intake Air Restriction 475
- Exhaust Air Restriction 476
- Engine Blowby 476
- Lubricating Oil Pressure 477
- Coolant Pressure 477
- Dynamometer (14-06) 478
- Dynamometer (14-07) 481
- Engine Painting (14-08) 482
- Air Heaters 490
- Coolant Heaters 490
- Engine Protection Controls 490
- Fuel Warmers 490
- Oil Heaters 491
- Reuse (16-01) 496
- Inspection for Reuse (16-03) 497
- Flywheel Housing - Redowel to 498
- Cylinder Block (16-04) 498
- Specifications - Group 18 505
- General Engine Specifications 507
- Exhaust System 508
- Fuel System 508
- Electrical System 508
- Pipe Plug Torque Values 510
- NT 855 Page 18-9 513
- Page 18-10 NT 855 514
- NT 855 Page 18-11 515
- Page 18-12 NT 855 516
- NT 855 Page 18-13 517
- Page 18-14 NT 855 518
- NT 855 Page 18-15 519
- Page 18-16 NT 855 520
- NT 855 Page 18-17 521
- Page 18-18 NT 855 522
- NT 855 Page 18-19 523
- Page 18-20 NT 855 524
- NT 855 Page 18-21 525
- Page 18-22 NT 855 526
- NT 855 Page 18-23 527
- Page 18-24 NT 855 528
- NT 855 Page 18-25 529
- Page 18-26 NT 855 530
- NT 855 Page 18-27 531
- Page 18-28 NT 855 532
- NT 855 Page 18-29 533
- Page 18-30 NT 855 534
- NT 855 Page 18-31 535
- Page 18-32 NT 855 536
- NT 855 Page 18-33 537
- Page 18-34 NT 855 538
- NT 855 Page 18-35 539
- Page 18-36 NT 855 540
- NT 855 Page 18-37 541
- Page 18-38 NT 855 542
- NT 855 Page 18-39 543
- Page 18-40 NT 855 544
- NT 855 Page 18-41 545
- Page 18-42 NT 855 546
- Cylinder Head - Torque Values 547
- Page 18-44 NT 855 548
- ST-1182 549
- NT 855 Page 18-45 549
- Fixed Injection Timing 550
- MVT Injection Timing 550
- NT 855 Page 18-47 551
- Page 18-48 NT 855 552
- NT 855 Page 18-49 553
- Page 18-50 NT 855 554
- NT 855 Page 18-51 555
- Page 18-52 NT 855 556
- NT 855 Page 18-53 557
- Page 18-54 NT 855 558
- NT 855 Page 18-55 559
- Page 18-56 NT 855 560
- NT 855 Page 18-57 561
- Page 18-58 NT 855 562
- NT 855 Page 18-59 563
- Page 18-60 NT 855 564
- NT 855 Page 18-61 565
- Cooling System -Torque Values 566
- NT 855 Page 18-63 567
- Page 18-64 NT 855 568
- NT 855 Page 18-65 569
- Page 18-66 NT 855 570
- NT 855 Page 18-67 571
- JacobsW Engine Brake 573
- Cummins C Brake 573
- Component Manufacturers 574
- N14Page C-2 575
- Torque Converters 576
- Additional Service Literature 578
- Order Total 580
- Page X-1 582
- Page X-2 583
- Page X-3 584
- Page X-4 585
- BUSINESS REPLY MAIL 586
- Literature Survey Form 587
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